JVC KSFX-772-R Service manual
SERVICE MANUAL
CASSETTE RECEIVER
KS-FX772R
KS-FX772R
Contents
TP/PTY
SEL
DISP
7
CD CHANGER CONTROL
MO
8
10
9
11 12
RPT
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
KS-FX772R
RND
MODE
TAP
E
DAB
FM/AM
¢
SSM
4
CDCH
SCM
Area Suffix
E Continental Europe
1-2
1-3
1-18
1-22
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
No.49694
Mar. 2002
Disassembly method
<Main body>
Removing the front panel assembly
(See Fig.1)
1.
Press the eject button in the lower right part of the
front panel. Remove the front panel assembly from
the body.
Removing the front chassis assembly
(See Fig.2 , 3)
KS-FX772R
Front panel assembly
Eject button
Fig.1
Joint a
Prior to performing the following procedure, remove
the front panel assembly.
1.
Release the four joints a on both sides of the front
chassis assembly and remove the front chassis
assembly toward the front.
Joint a
Front chassis assembly
Heat sink
Fig.2
Joint a
Joint a
Front chassis
assembly
Fig.3
1-3
KS-FX772R
Removing the heat sink (See Fig.4)
1.
Remove the three screws A on the left side of the
body.
Removing the bottom cover
(See Fig.5 , 6)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.
1.
Turn over the body and unjoint the five joints b with
the bottom cover and the body using a screwdriver.
A
Joint b
Joint b
Heat sink
Fig.4
Rear panel
Fig.5
A
Bottom cover
Joint b
Joint b
Bottom cover
Joint b
Joint b
Rear panel
Fig.6
1-4
KS-FX772R
Removing the main board
(See Fig.7 , 8)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink and the bottom cover.
1.
Remove the screw B, the three screws C and the
two screws D attaching the rear bracket on the back
of the body. Remove the rear panel.
2.
Remove the two screws E attaching the main board
on the bottom of the body. Disconnect connector
CN701 on the main board in the direction of the
arrow.
D
E
Rear panel
Fig.7
C
Main board
B
C
D
E
Removing the cassette mechanism section
(See Fig.9)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink, the bottom cover and the main board.
1.
Remove the four screws F attaching the cassette
mechanism section on the back of the top chassis.
Fig.8
Cassette mechanism section
F
F
Fig.9
CN701
F
F
Top chassis
1-5
KS-FX772R
Removing the control switch board
(See Fig.10 ~ 12)
Prior to performing the following procedure, remove
the front panel assembly.
1.
Remove the four screws G attaching the rear cover
on the back of the front panel assembly.
2.
Unjoint the eleven joints c with the front panel and
the rear cover.
3.
Remove the control switch board on the back of the
front panel.
G
G
Front panel
Rear cover
Joint c
G
G
Fig.10
Joint c
Joint c
Rear cover
Front panel
Joint c
Fig.11
Control switch board
Fig.12
1-6
KS-FX772R
REFERENCE:
Prior to performing the following
procedures, turn the mode gear on the
bottom of the body until the respective part
comes to the EJECT position (Refer to
Fig.1).
Removing the cassette guide (See Fig.2)
1.
Turn the mode gear to set to RVS play or
subsequent mode.
2.
Remove the cassette guide from the main chassis
while releasing each two joint tabs a in the direction
of the arrow.
Mode gear
Fig.1
Cassette guide
Removing the load arm (See Fig.3)
1.
Remove the E-washer attaching the load arm.
2.
Move the load arm in the direction of the arrow and
release the joint b on the cassette catch.
Load arm
E-washer
Tab a
Joint b
Tab a
Fig.2
Fig.3
1-7
KS-FX772R
Removing the cassette hanger assembly /
cassette holder (See Fig.4 to 7)
1.
Check the mode is set to EJECT. Push down the
front part of the cassette holder and move in the
direction of the arrow to release the joint c.
2.
Move the rear part of the cassette hanger assembly
in the direction of the arrow to release it from the two
joint bosses d.
3.
Release the holder stabilizer spring from the hooks e
and f, then pull out from the cassette hanger
assembly.
4.
Bring up the rear side of the cassette hanger
assembly to release the joint g and h.
5.
Pull out the cassette catch from the cassette hanger
assembly.
Cassette holder assembly
Side bracket
Joints c
Cassette holder assembly
Cassette stabilizer spring
Fig.4
Boss d
Cassette hanger assembly
Cassette hanger
assembly
Boss d
Cassette holder
assembly
Hook g
Fig.6
Hook f
Hook e
Fig.5
Cassette hanger assembly
Cassette catch
Cassette holder assembly
Cassette hanger assembly
Hook h
Fig.7
1-8
KS-FX772R
Removing the side bracket assembly
(See Fig.8 to 10)
1.
Remove the screw A attaching the side bracket
assembly.
2.
Detach the front side of the side bracket assembly
upward and pull out forward to release the joint i and
j in the rear.
CAUTION:
CAUTION:
When reassembling, make sure that the
boss k of the main chassis is set in the
notch of the load rack under the side
bracket assembly. Do not reattach the
load rack on the boss k.
After reattaching the side bracket
assembly, confirm operation.
Side bracket assembly
Joint i
Joint j
A
Side bracket assembly
Fig.8
Side bracket assembly
Joint i
Joint j
Load rack
Load rack
Boss k
Boss k
Fig.9
Fig.10
1-9
KS-FX772R
Removing the pinch arm (F) assembly
(See Fig.11 and 12)
1.
Remove the polywasher and pull out the pinch arm
(F) assembly.
2.
Remove the compulsion spring.
Removing the pinch arm (R) assembly
(See Fig.11 and 13)
1.
Remove the polywasher and pull out the pinch arm
(R) assembly.
Removing the slide chassis assembly
(See Fig.14 and 15)
Polywasher
Pinch arm
(R) assembly
Polywasher
Compulsion spring
Fig.11
Pinch arm
(F) assembly
Pinch arm (F) assembly
Polywasher
REFERENCE:
It is not necessary to remove the head
and the tape guide.
1.
Move the slide chassis assembly in the direction of
the arrow to release the two joints l and remove from
the main chassis.
2.
Remove the rack link.
CAUTION:
When reassembling, first reattach the rack
link, and next fit the boss m and hook n of
the slide chassis assembly to the hole of
the main chassis, and engage the two joints
l.
Rack link
Fig.12
Boss m
Pinch arm
(R) assembly
Fig.13
Head
Hook n
Polywasher
Tape guide
Joint l
Slide chassis assembly
1-10
Fig.14
Joint l
Fig.15
KS-FX772R
Removing the head / tape guide
(See Fig.16 and 17)
REFERENCE:
1.
Remove the band attaching the wire to the head.
2.
Remove the two screws B, the head and the head
support spring.
3.
Remove the pinch arm spring from the tape guide.
4.
Remove the tape guide and the pinch spring arm.
CAUTION:
CAUTION:
It is not necessary to remove the slide
chassis assembly.
When reattaching the pinch arm spring, set
both end of it to the pinch spring arm (
remarked o).
When reattaching the head, set the wires
into the groove of the tape guide (Fig.16).
B
Slide chassis assembly
Head
Tape guide
Fig.16
B
Pinch arm spring
Head
Head support spring
Tape guide
Removing the flywheel assembly (F) & (R)
(See Fig.18 and 19)
REFERENCE:
1.
Remove the belt at the bottom.
2.
Remove the two polywashers on the upper side.
3.
Pull out each flywheel assembly downward.
Flywheel assembly (F)
It is not necessary to remove the slide
chassis assembly.
Belt
o
Pinch spring arm
o
Slid chassis assembly
Fig.17
Polywasher
Polywasher
Flywheel assembly (R)
Fig.18
Flywheel assembly (F)
Fig.19
Flywheel assembly (R)
1-11
KS-FX772R
Disassembling the flywheel assembly (F)
(See Fig.20 and 21)
1.
Push and turn counterclockwise the spring holder (F)
to release the three joints p on the bottom of the
flywheel.
2.
The spring holder (F), the TU spring and the friction
gear play come off.
3.
Remove the polywasher and felt.
Flywheel assembly (F)
Joints p
Flywheel assembly (R)
Joints q
Disassembling the flywheel assembly (R)
(See Fig.20 and 22)
1.
Push and turn clockwise the spring holder (R) to
release the three joints q on the bottom of the
flywheel.
2.
The spring holder (R), the FF spring and the friction
gear FF come off.
3.
Remove the polywasher and the felt.
Removing the reel board
(See Fig.23 and 24)
1.
Remove the two screws C attaching the reel board.
2.
Move the reel board in the direction of the arrow to
release the joint r.
3.
Unsolder the wires if necessary.
CAUTION:
When reattaching, confirm operation of
the MODE switch and the ST-BY switch.
The mode position between EJECT and
ST-BY is optimum for reattaching.
Joint p
Fig.20
Polywasher
Polywasher
Spring holder (R)
Spring holder (F)
TU spring
Friction gear FF
Friction gear play
Felt
Flywheel assembly (F)
FF spring
Felt
Flywheel assembly (R)
Fig.21 Fig.22
Joint q
1-12
Connect the card wire extending from
the reel board to the FFC pad before
reattaching the reel board.
FFC pad
C
Reel board
C
Fig.23
Joint r
FFC pad
CT-1 switch
MODE switch
Soldering
ST-BY switch
Fig.24
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